
YOUNG MICRO SYSTEMS, INC.

CROSS 486G-VLB

Processor  SL80486SX/80486SX/SL80486DX/80486DX/80486DX2/80486DX4/P24D/ Pentium
           Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   OPTI
Max.       128MB
Onboard
DRAM
Cache      64/128/256/512KB
BIOS       AMI
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Turbo switch                J1        Reset switch               J4

  Power LED & keylock         J2        Turbo LED                  J5

  Speaker                     J3        32-bit VESA local      SL1 - SL3
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP1              Open
      alter

      Factory configured - do not             JP2           pins 1 & 2
      alter                                                   closed

     Monitor type select color               JP3             Closed

      Monitor type select monochrome          JP3              Open

     Factory configured - do not             JP8              Open
      alter

     Factory configured - do not             JP11            Closed
      alter

     Factory configured - do not             JP12             Open
      alter

     Factory configured - do not             JP13             Open
      alter

     Factory configured - do not             JP14             Open
      alter

     Factory configured - do not             JP15             Open
      alter

     Factory configured - do not             JP16             Open
      alter

     Factory configured - do not             JP17             Open
      alter

     Factory configured - do not             JP18             Open
      alter

     Factory configured - do not             JP20          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP21          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP22             Open
      alter

     Factory configured - do not             JP25             Open
      alter

     Factory configured - do not             JP28          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP30             Open
      alter

     Factory configured - do not             JP31          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP38             Open
      alter

     Factory configured - do not             JP39             Open
      alter

     Factory configured - do not             JP40            Closed
      alter

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

      1MB         (1) 256K x       NONE           NONE           NONE
                     36

      4MB         (1) 512K x     (1) 512K x       NONE           NONE
                     36             36

      4MB        (1) 1M x 36       NONE           NONE           NONE

      8MB        (1) 1M x 36    (1) 1M x 36       NONE           NONE

      8MB        (1) 2M x 36       NONE           NONE           NONE

     16MB        (1) 4M x 36       NONE           NONE           NONE

     16MB        (1) 1M x 36    (1) 1M x 36    (1) 1M x 36   (1) 1M x 36

     32MB        (1) 4M x 36    (1) 4M x 36       NONE           NONE

     32MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

     64MB        (1) 8M x 36    (1) 8M x 36       NONE           NONE

     64MB        (1) 4M x 36    (1) 4M x 36    (1) 4M x 36   (1) 4M x 36

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

      64KB        (4) 8K x 8      (4) 8K x 8      (1) 8K x 8

     128KB        (4) 32K x 8        NONE         (1) 8K x 8

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 32K x 8

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

                     CACHE JUMPER CONFIGURATION

   Size     JP32      JP33     JP34      JP35      JP36      JP37

   64KB     Open     2 & 3     2 & 3     Open      Open      Open

  128KB     Open     2 & 3     1 & 2     Open     Closed     Open

  256KB     Open     2 & 3     2 & 3     Closed   Closed     Open

  512KB     Closed    Open     1 & 2     Closed   Closed    Closed

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

     Type        JP9       JP10      JP19     JP29     JP106      JP107

  SL80486SX     Closed    Closed     Open     2 & 3    Open       Open

   80486SX      Closed    Closed     Open     2 & 3    Open       Open

  SL80486DX     Closed    Closed     1 & 2     1 &     Open       Open
                                              2, 3
                                              & 4

   80486DX      Closed    Closed     1 & 2     1 &     Open       Open
                                              2, 3
                                              & 4

   80486DX2     Closed    Closed     1 & 2     1 &     Open       Open
                                              2, 3
                                              & 4

   80486DX4      Open      Open      1 & 2     1 &    Closed     Closed
                                              2, 3
                                              & 4

     P24D       Closed    Closed     1 & 2     1 &     Open       Open
                                              2, 3
                                              & 4

     P24T        Open      Open      1 & 2     1 &    Closed     Closed
                                              2, 3
                                              & 4

  Note: Pins designated should be in the closed position.

          CPU SPEED CONFIGURATION

   Speed      JP5        JP6        JP7

   25MHz      Open       Open     Closed

   33MHz     Closed      Open     Closed

   40MHz      Open      Closed    Closed

  50iMHz      Open       Open     Closed

   50MHz     Closed     Closed    Closed

  66iMHz     Closed      Open     Closed

  75iMHz      Open       Open     Closed

  100iMHz    Closed      Open     Closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP26

          2x            pins 1 & 2 closed

         2.5x           pins 2 & 3 closed

          3x                   Open

  VESA WAIT STATE CONFIGURATION

   Wait states         JP23

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        JP24

   <= 33MHz        Open

   > 33MHz        Closed

                            BIOS CONFIGURATION

          Setting                    JP4                    JP27

     CMOS memory normal       pins 2 & 3 closed       pins 1 & 2 closed
         operation

     CMOS memory clear        pins 1 & 2 closed       pins 2 & 3 closed

